As I think I said before, I used SSOTS 3.15 to stop and then uninstall the previous Squeezecentre so I didn't dive in and manually delete anything. The options to manage the old Squeezecentre are in the SSOTS.
As a separate SSOTS is no longer needed for the new setup that was then removed before updating to the latest TS109 firmware.
You're right that the official list of QPKG plugins from the interface only offers LMS 7.6.1. In fact when selected I noticed LMS 7.5.1 was about to be downloaded.
I downloaded LMS 7.7.1 from the link given in these forums viewtopic.php?f=123&t=35740
(selecting the arm based 109,209 & 409 series.)
Doug, ** U.K.